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ISO 15709-2002
Soil quality. Soil water and the unsaturated zone. Definitions,symbols and theory first edition
适用范围：This International Standard gives a simplified theory of the physics of soil water in the unsaturated zone and defines a set of terms, quantities, units and symbols used in the field of soil physics investigation of the unsaturated zone. This International Standard is applicable only to standards on soil physical investigations of the unsaturated zone (including swelling soils) elaborated within ISO/TC 190. This International Standard specifically excludes macropore flow.
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